Many life cycle impact assessment (LCIA) methods established by developed countries are used for studies in Thailand. The results from the studies might not reflect the precise context and interests of Thailand, particularly linked with policy implementation. This study proposes the Thai Ecological Scarcity method based on the political distance-to-target approach, covering relevant environmental impacts and following the Swiss eco-factors 2013. The Thai Eco Factors (TEFs) were developed as the quantitative indicators for the considered pollutants or resources using the normalization and current flows of 2011 obtained mainly from official data sources, as base year data. The critical flows were extracted from relevant existing policy targets of Thailand. Policy preference and damage potential oriented characterization were applied in the calculation of the TEFs. The environmental impacts were classified into 17 categories covering all policy-concerned aspects. In addition, the national environmental burdens of Thailand based on the current status were assessed comparing the target status. It was also seen that environmental impact reduction of 38% could be achieved if all the existing environmental policy targets in Thailand were successfully implemented. This LCIA method is initiated from the current legislation objectives of Thailand. It is anticipated that in the future, updated policy targets and more accurate flow data would be available to improve these developed Thai Eco Factors.